TBolt said:Hi, this may be a real amateur question, but I was wondering why on most classic racers I have seen, there is a spring from near the top of the exhaust to a fin on the head? Is it to change exhaust quickly instead of having to undo a bolt?
Thank You
acotrel said:I don't use the finned exhaust nut, with methanol it is not needed -
Dances with Shrapnel said:Spigotting the exhaust header: The general idea is to remove the stress riser where the header "was" clamped into the head.
acotrel said:I have read claims the manx Nortons perform better with larger diameter pipes - I would never go that way. Actually it was pretty funny when one day, years ago I was in the workshop of a friend who had the most developed and successful manx in Victoria. His pipe was hanging off the rafter, and I looked at it and said to him 'gee that's a skinny pipe'. He said 'you bastard, you notice too much'.
daveh said:Dances with Shrapnel said:Spigotting the exhaust header: The general idea is to remove the stress riser where the header "was" clamped into the head.
I remember Matt at CNW saying that they tried a spigoted header on a street Commando but there was a decline in performance due to the larger diameter pipe.